Solve : which program is using ??

1.	Solve : which program is using ??
Answer» when i TRY to DELETE some applicaiton or file or bla bla .... it GIVES some error like : "it is use by some aplicaiton ....." i KNOW that which appllicaiton ? can we see it using any applicaiton ?Delete, or uninstall? What application? What file?

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